Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The TEM (a), HRTEM (b), and AFM (c) images of the CDs. The inset in (a) shows the particle size distribution histogram. The inset in (c) shows the height-profile analysis along the corresponding line. The FTIR (d), high-resolution XPS spectra of C 1s (e) and N 1s (f) of the CDs show the existing chemical bonds and compositions.
